Okay so ive done as much research as i can talked to 20 people had my car looked at by 4 different shops noone can figure it out. I have a 02 a4 5 speed 1.8T. Mods are Samco DV, test pipe, samco TIP, APR stage 1+ upgrade which includes injectors and software with cat delete program. I also have a Carbonio intake. When I had just stage 1 with the intake, DV and TIP the car ran fine. Since I have done the Stage 1+ and the test pipe it feels like the boost shuts off randomly. Meaning I can be driving down the road and get full boost, come to a stop light and go to take off and it is like it got put back into stock mode. It is litterally that random. I have tried changing the DV spring for a stronger one still does the same thing. Plugs and coils changed, leak test done still does the same s**t. I have no clue anymore. Any help is appreciated.